Q: Jerking reaction

asked by on February 09, 2017

i bought this vehicle yesterday. i put tank full of gas & drove via freeway. then the RPM value was gone up & down suddenly even not I accelerate. further when i came to local street my car was jerked 2 times. but not a that much trouble. need to know the reason for this?

My car has 135000 miles.
My car has an automatic transmission.

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